B2 Biology - Stem cells and differentiation Flashcards Preview

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Flashcards in B2 Biology - Stem cells and differentiation Deck (18)
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1

what does undifferentiated mean? and what are they called?

cells can develop in to different types of cells
they are called stem cells

2

where are stem cells found in humans?

bone marrow

3

how are scientists trying to get one specific type of stem cell?

by changing the environment they're growing in

4

why do some people think stem cell research is a bad thing?

- people believe that you are killing something with the potential to grow into human life
- unwanted cells are destroyed
-its just purely unethical

5

what is the 23rd pair of chromosomes labelled?

XX and XY

6

XY
XX
what do they mean?

XY = MALE
XX = FEMALE

7

what are genetic diagrams?

they help you find the possibility of getting a boy or a girl

8

how could stem cells be used to treat disorders?

the cells can turn into new blood cells or replace faulty cells within the body

9

who was Gregor Mendel? what did he show?

a monk who studied in maths and natural history
he showed that characteristcs in plants are passed on to the next generation

10

what are the two hereditary units?

dominant and recessive

11

what are alleles?

different versions of the same gene

12

what does homozygous mean?

organism with two alleles for a particular gene

13

what does heterozygous mean?

two alleles for the same gene are different

14

is cystic fibrosis caused by recessive or dominant allele?

recessive

15

is polydactyly caused by R or D allele?

Dominant

16

what chance do babies have of getting CF if their parents are both carriers?

1 in 4 chance

17

why is embryo screening seen as a bad thing?

- can choose what your baby looks like, unethical
-rejected embryos are destroyed
-screening is expensive

18

why is embryo seen as a good thing?

- stop people suffering
-treating disorders can cost, this will save lots of money for the gov.